Re: [2.6.0-test9] QoS HTB crash...

Daniel Blueman
2003-11-01T18:13:35Z

Having applied this patch, I still get this issue when I kill pppd:

Oops: 0002 [#1]
CPU: 0
>>EIP; c02ced99 <htb_unbind_filter+49/6b> <=====

>>ebx; d9c0586c <_end+19797f60/3fb906f4>
>>ecx; dc95adf8 <_end+1c4ed4ec/3fb906f4>
>>edx; d9c057f8 <_end+19797eec/3fb906f4>
>>esi; dc95adf8 <_end+1c4ed4ec/3fb906f4>
>>edi; df4eceac <_end+1f07f5a0/3fb906f4>
>>ebp; d9c4bdfc <_end+197de4f0/3fb906f4>
>>esp; d9c4bde4 <_end+197de4d8/3fb906f4>

Trace; c011a647 <kernel_map_pages+28/5d>
Trace; c02d3876 <u32_destroy_key+6a/6c>
Trace; c02d3b1f <u32_clear_hnode+2e/48>
Trace; c02d3b5e <u32_destroy_hnode+25/a9>
Trace; c011a647 <kernel_map_pages+28/5d>
Trace; c02d3cc4 <u32_destroy+e2/110>
Trace; c02ce073 <htb_destroy_class+18b/1c3>
Trace; c02cdedc <htb_destroy_filters+1d/29>
Trace; c02ce112 <htb_destroy+67/d2>
Trace; c02c1ea9 <qdisc_destroy+81/92>
Trace; c02c260a <dev_shutdown+aa/268>
Trace; c01398e8 <wakeme_after_rcu+0/c>
Trace; c02b59e2 <unregister_netdevice+db/352>
Trace; c02bd6ce <rtnl_lock+22/37>
Trace; c0235f8c <unregister_netdev+19/25>
Trace; c023c1ce <ppp_shutdown_interface+21e/3ba>
Trace; c0183836 <dput+23/723>
Trace; c016527c <__fput+7c/cd>
Trace; c02363a5 <ppp_release+5f/61>
Trace; c01652bb <__fput+bb/cd>
Trace; c0163353 <filp_close+57/81>
Trace; c0163481 <sys_close+104/228>
Trace; c010a3eb <syscall_call+7/b>

Code; c02ced99 <htb_unbind_filter+49/6b>
00000000 <_EIP>:
Code; c02ced99 <htb_unbind_filter+49/6b> <=====
0: 83 ae 58 01 00 00 01 subl $0x1,0x158(%esi) <=====
Code; c02ceda0 <htb_unbind_filter+50/6b>
7: 8b 5d f8 mov 0xfffffff8(%ebp),%ebx
Code; c02ceda3 <htb_unbind_filter+53/6b>
a: 8b 75 fc mov 0xfffffffc(%ebp),%esi
Code; c02ceda6 <htb_unbind_filter+56/6b>
d: 89 ec mov %ebp,%esp
Code; c02ceda8 <htb_unbind_filter+58/6b>
f: 5d pop %ebp
Code; c02ceda9 <htb_unbind_filter+59/6b>
10: c3 ret
Code; c02cedaa <htb_unbind_filter+5a/6b>
11: 83 ab 3c 00 00 00 00 subl $0x0,0x3c(%ebx)

<0>Kernel panic: Fatal exception in interrupt

---

> On Thu, 30 Oct 2003 20:50:16 +0100 (CET)
> devik <devik@cdi.cz> wrote:
>
> > thanks for the report. I know that there is an issue regarding
> > HTB in 2.6.x. Please send me net/sched/sch_htb.o,
> > net/sched/sch_htb.c (just to be sure) and be sure that you
> > build the kernel with debugging symbols (see debugging section
> > of menuconfig/xconfig).
>
> I think the problem is the changes that were made
> in 2.5.x to htb_next_rb_node(). It used to be:
>
> static void htb_next_rb_node(rb_node_t **n)
> {
> rb_node_t *p;
> if ((*n)->rb_right) {
> /* child at right. use it or its leftmost ancestor */
> *n = (*n)->rb_right;
> while ((*n)->rb_left)
> *n = (*n)->rb_left;
> return;
> }
> while ((p = (*n)->rb_parent) != NULL) {
> /* if we've arrived from left child then we have next node
> */
> if (p->rb_left == *n) break;
> *n = p;
> }
> *n = p;
> }
>
> But it was changed into:
>
> static void htb_next_rb_node(struct rb_node **n)
> {
> *n = rb_next(*n);
> }
>
> This is wrong, the new code has much different side effects
> than the original code.
>
> This looks like the problem, devik what do you think?
>

--
Daniel J Blueman

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